The reaction mechanism of diethyl-2,3-dicyano-2,3-di(p,m-dimethoxylphenyl) succinate with styrene

Ma, Jiantai; Qi, Chenze; Wu, Yanjie; Wang, Tianmin; Li, Huamei; Shen, Yan; Lü, Jianming; Wu, Jieying

doi:10.1002/(sici)1097-4628(19991031)74:5<1140::aid-app10>3.0.co;2-j

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Influence of isomer ratio and ring substituents in decomposition activation energies of α,α,α′,α′‐tetrasubstituted dibenzyls

et al. 2001

J of Applied Polymer Sci

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Diethyl-2,3-dicyano-2,3-di-(X-substituted phenyl) succinates (X ϭ p-OCH 3 , p-CH 3 , p-Cl, H, p-NO 2 ) can initiate the free-radical polymerization of styrene. The decomposition rate constant and activation energy were measured by means of a dilatometer, and the results showed that they were strongly dependent on the ratio of meso-and dl-isomers in the polysubstituted dibenzyl compounds and the properties of the ring substituents. On the other hand, it was found that the polystyrenes, which were obtained by initiation with hydrogen, had a much larger average molecular weight than that with p-OCH 3 and p-CH 3 . The experimental phenomena were correlated with the structure of the radical resulting from hydrogen.

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